spring PropertiesEditor 源码
spring PropertiesEditor 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/propertyeditors/PropertiesEditor.java
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.beans.propertyeditors;
import java.beans.PropertyEditorSupport;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.Properties;
import org.springframework.lang.Nullable;
/**
* Custom {@link java.beans.PropertyEditor} for {@link Properties} objects.
*
* <p>Handles conversion from content {@link String} to {@code Properties} object.
* Also handles {@link Map} to {@code Properties} conversion, for populating
* a {@code Properties} object via XML "map" entries.
*
* <p>The required format is defined in the standard {@code Properties}
* documentation. Each property must be on a new line.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @see java.util.Properties#load
*/
public class PropertiesEditor extends PropertyEditorSupport {
/**
* Convert {@link String} into {@link Properties}, considering it as
* properties content.
* @param text the text to be so converted
*/
@Override
public void setAsText(@Nullable String text) throws IllegalArgumentException {
Properties props = new Properties();
if (text != null) {
try {
// Must use the ISO-8859-1 encoding because Properties.load(stream) expects it.
props.load(new ByteArrayInputStream(text.getBytes(StandardCharsets.ISO_8859_1)));
}
catch (IOException ex) {
// Should never happen.
throw new IllegalArgumentException(
"Failed to parse [" + text + "] into Properties", ex);
}
}
setValue(props);
}
/**
* Take {@link Properties} as-is; convert {@link Map} into {@code Properties}.
*/
@Override
public void setValue(Object value) {
if (!(value instanceof Properties) && value instanceof Map) {
Properties props = new Properties();
props.putAll((Map<?, ?>) value);
super.setValue(props);
}
else {
super.setValue(value);
}
}
}
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